fix(in-app-messaging): resolve issues blocking CI

[calebpollman]

Description of changes

• add react-native-safe-area-context mock, remove individual mocks
• add yarn react-core test and yarn react-native test to yarn test
• update the exports snapshot in @aws-amplify/ui-react

Issue #, if available

NA

Description of how you validated changes

yarn test

Checklist

• PR description included
• yarn test passes
• Tests are updated
• No side effects or sideEffects field updated
• Relevant documentation is changed or added (and PR referenced)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

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[ioanabrooks]

Cool, thanks for unblocking this!